Air cushion



FIG. 1 is a top perspective view of an air cushion;

FIG. 2 is a top view of the air cushion illustrated in FIG. 1;

FIG. 3 is a bottom view of the air cushion illustrated in FIG. 1

FIG. 4 is a front elevation view of the air cushion illustrated in FIG.1;

FIG. 5 is a rear elevation view of the air cushion illustrated in FIG.1;

FIG. 6 is a left side elevation view of the air cushion illustrated inFIG. 1; and,

FIG. 7 is a right side elevation view of the air cushion illustrated inFIG. 1.

CLAIM The ornamental design for an air cushion, as shown and described.